Re: [M]: Date: Sun, 2 Jan 2000 12:49:50 +0100
| Subject: | Re: [M]: Date: Sun, 2 Jan 2000 12:49:50 +0100 |
| From: | Dave Feldstein |
| Date: | Sun Jan 02 05:22:08 2000 |
Yes using Photshop or photopaint or Paint shop which I used, you can use
the rubber stanp or cloneing tool to pick up some black background color
and literally erase that artifact. While I do not know what caused it I
can tell you your focus was off. If you look at the diffraction spikes
around the bright star at the bottom the spikes have not converged if
you were in perfect focus those spikes would have come together leaving
you with 4 spikes. I have sent you the image back via private post with
the artifact removed, I also reduced the size so the file wouldnt be so
large when sending via email. A good way to ensure good focus is to
point to a bright star and focus with the background and foreground set
to 90 this will really show the diffraction spikes clearly when they
merrge your all set for the night unless the temperature drops alot.
Clear Skies
Dave Feldstein
http://www.dfstarman.com
> Mogens Winther - Home Adress wrote:
>
> Please - concerning this Orion test image :
> http://www.amtsgym-sdbg.dk/as/ori-test/
>
> On top of this image - one may observe assymetric reflections of some
> bright stars.
>
> Does anyone know if this could be a collimation effect ? - an effect
> , which may be removed in a simple way ?
>
>
> Best wishes for the new millenia
>
> Mogens Winther
the rubber stanp or cloneing tool to pick up some black background color
and literally erase that artifact. While I do not know what caused it I
can tell you your focus was off. If you look at the diffraction spikes
around the bright star at the bottom the spikes have not converged if
you were in perfect focus those spikes would have come together leaving
you with 4 spikes. I have sent you the image back via private post with
the artifact removed, I also reduced the size so the file wouldnt be so
large when sending via email. A good way to ensure good focus is to
point to a bright star and focus with the background and foreground set
to 90 this will really show the diffraction spikes clearly when they
merrge your all set for the night unless the temperature drops alot.
Clear Skies
Dave Feldstein
http://www.dfstarman.com
> Mogens Winther - Home Adress wrote:
>
> Please - concerning this Orion test image :
> http://www.amtsgym-sdbg.dk/as/ori-test/
>
> On top of this image - one may observe assymetric reflections of some
> bright stars.
>
> Does anyone know if this could be a collimation effect ? - an effect
> , which may be removed in a simple way ?
>
>
> Best wishes for the new millenia
>
> Mogens Winther
